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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/96255] [F2018] Implement optional type spec for index
 in DO CONCURRENT
Date: Thu, 11 Nov 2021 21:01:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96255

--- Comment #9 from anlauf at gcc dot gnu.org ---
(In reply to kargl from comment #8)
> New patch.  This adds a bool component to gfc_forall_iterator so
> that an iterator with an index-name that shadows a variable from
> outer scope can be marked.  Shadowing only occurs when a type-spec
> causes the kind type parameter to differ from the kind type=20
> parameter of the outer scope variable.

F2018: 19.4  Statement and construct entities

(6) The name of a variable that appears as an index-name in a DO CONCURRENT
    construct, FORALL statement, or FORALL construct  has a scope of the
    statement or construct. ...

So the index variable may inherit the kind of a declared variable if there
is no typespec, but we always have to shadow a variable of that name from
the outer scope.

This is confirmed by Intel and NAG.=